[asmosoinio]

We did something similar for regular golf at Nokia, released 2006: http://www.allaboutsymbian.com/reviews/item/nokia_n93_golf_e...

Haven't looked much at the market since, but I would guess generic sports video "record+compare" tools would be available nowadays in app stores?

Back on 2006 that video handling was quite a tech feat, nowadays should be straight forward on any modern phone.